Work
TRIPLE POINTS!
What is work? (Give the definition or formula)
The amount of effort spent when a force causes an object to move a distance.
W = Force x Distance
The parts that go into a system to make it function, such as energy, force, or raw materials.
INPUTS
Another word for an inclined plane is a...
RAMP
What is the formula for mechanical advantage?
MA = Output Force / Input Force
DOUBLE POINTS!
TRUE or FALSE
A garden is an example of a real world physical system
TRUE
Purpose -> to grow things such as plants or foods
Inputs -> sunlight, water, fertilizer, seeds
Outputs -> anything that grows (plants, flowers, foods)
If you push something up a ramp with a force of 150N and it moves 2 meters. How much work is being done?
300 Joules of Work
W = f x d = 150 x 2 = 300
A set of connected parts that work together to perform a task.
SYSTEMS
Which of the following is NOT one of the six simple machines?
a) Wheel and Axle
b) Magnet
c) Inclined Plane
d) Pulley
e) Screw
f) Lever
Magnet
DOUBLE POINTS!
Calculate the mechanical advantage when using a ramp to pull a box: 770 N weight, 110 N applied force.
The mechanical advantage is 7
MA = Output / Input = 770 / 110 = 7
TRUE or FALSE
You are doing work when you walk down the hallway while wearing your backpack
FALSE
You are moving forward, but you are not actively applying any force on the backpack for it to move a distance. The only force you are exerting is the upward force to counteract gravity acting down on you.
The metric unit used for work
What is the joule (J)?
DOUBLE POINTS!
The parts or results that are produced by a system, such as motion, heat, or finished products.
OUTPUTS
TRUE or FALSE
Simple machines reduce the amount of friction needed to do work in a system
FALSE
They reduce the amount of FORCE needed to make work and tasks easier. They often provide a mechanical advantage!
The unit used to measure force.
What are Newtons (N).
TRUE or FALSE
Your backpack is really heavy, so you decide to slide it down the hallway by pulling on the straps causing it to move a few meters in front of you.
TRUE
The backpack is moving a distance in the same direction of the pull force being applied to it.
TRUE or FALSE
You push a heavy box with a lot of force and it does not move. Because you put in so much force you clearly have done a lot of work
FALSE
Scientific work only occurs when an object has moved a distance in the same direction of the force being applied
Give 2 examples of a SOCIAL systems and 2 examples of a PHYSICAL systems
Answers vary...
Social = School, Hospital, Government
Physical = Car, Bicycle, Airplane, Human Body
What is the name of the pivot point that that a lever rests on?
FULCRUM
TRUE or FALSE
The longer the effort arm in a lever, the greater the mechanical advantage there will be!
TRUE
Name 2 ECONOMIC, 2 SOCIAL and 2 ENVIRONMENTAL impacts of automated self driving cars
Economically → reduced labor costs, increase productivity and delivery speed.. Faster service
Social → job loss for drivers, affecting their family well being; increased reliance on AI and technology
Environmental → reduced carbon emissions, gas pollution from larger delivery trucks and factories; less drivers on the road, safer working conditions